Bump perl from 5.38 to 5.40 (#51)

Bumps perl from 5.38 to 5.40.

---
updated-dependencies:
- dependency-name: perl
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM perl:5.38
+FROM perl:5.40
 
 COPY . /usr/src/zarn
 WORKDIR /usr/src/zarn